Steve, the original kits that I worked from left a bit to be desired. The machined, solid LEs did not line up when the ply joiner was inserted in the slot provided in the back. With two kits, the step ranged from about 1mm to about 2.5mm.
We replaced the machined LEs with a 3/16" square on edge and strips wide enough to match the machined LE. The racers in our club replace the balsa LE with spruce to provide a bit more strength.
As Mike said, we changed the spars to 1/8" x 1/2" on the surface so that the centre of the wing could be stronger with diagonal bracing or shear webs and the tail feathers are 3/16" instead of 1/8".
We added a sheet landing gear and wheel pants that followed the lines of the Enhanced Landing Gear on the instruction sheet for the Goldbrg kit and provided details of the wire landing gear for those who wanted it.
Otherwise, the outlines of everything are exactly per the Goldberg model.
I've since made a small change to the back of the tip rib—a change that Brodaks have not incorporated. If anybody wants the details, contact me.
The actual colour of the original aircraft is Cadillac Chartruese used on Cadillac convertibles for only a couple of years back then. As mentioned, it's a very pale green, certainly not as dark as the aircraft on display at Planes of Fame. I describe it as like an almost ripe lemon. The red was called Chinese Red.